The Zohar, Chapter “ Ve’Eleh Toldot Itzhak (These Are the Generations of Isaac),” Item 14: Even though all the people in the world are from Israel, they are all worthy of blessing the Creator. But blessings for which upper and lower are blessed, who are they who bless Him? It is the servants of the Creator. And who are they whose blessing is a blessing? It is them who stand in the house of God at night, those who rise at midnight and awaken to read in the Torah. They are the ones who stand in the house of God at night. And they need both: to be servants of the Creator, as well as to rise at midnight, for then the Creator comes to entertain with the righteous in the Garden of Eden.
In the science of Kabbalah, “midnight” does not correspond to the time fixed by astronomical hours and the rotation of the planet earth. Rather, it corresponds to the state of a person who builds spiritual senses (Kelim) within.
This person is in the state of darkness because his previous level has completely exhausted itself like a grain that rots in the soil. This is a necessary condition for acquiring a new degree; his previous state must “rot” in regard to him.
Then he begins to see a new level from within the darkness, which is formed by the following level and the Upper Light that lie ahead of him. For now it appears as darkness to him because he senses it through his current qualities. After all, every subsequent level is a greater degree of bestowal in relation to the uncorrected will to enjoy that becomes revealed to him.
On one hand, a greater Light shines for him, but on the other hand, he reveals an additional, uncorrected will to enjoy within him. He already has a new level within him, but he perceives it as darkness, a lack of Light within the desire.
Because his additional desire is not yet corrected, he experiences the Light as darkness. This makes him search for a way to change his attitude to his perceived reality. In and of itself reality is always a part of the corrected Malchut, which gradually becomes revealed to him more and more.
A person constantly changes his perception, sensation, and awareness, as well as his attainment of his state. He then demands the Light that Reforms; yet, he does not do it to make reality change, but to change his perception of reality.
Therefore, this person is called “a servant of the Creator” because he understands that in every state, everything comes from “There is none else beside Him.” Only the person’s perception of reality changes as a result of him correcting his qualities (Kelim).